Pump



O. HENTJENS Apri l 1924o PUMP Filed Jan. 50, 1922 INVENTR @ha @MW BMATTORNEYS rune.

Application filed Janueiy 3G, i922. Serial Ho. 532,733.

To all wtom t may concern:

Be it known that l, Orfro lllnnnrsnns, a citizen ci.' the GeiinsnRepublic, resi ling et Hazleton, in the county ci lluzerne and State oflennsylvanin, have invented certain new und useful improvements inPumps, or which the following is a specification.

My invention relates to pumps, and particulerly to vacuum pumps, theobject of my invention being to provide a pump of siin.- ple Iandefiicient design which requires no priming, has exposed valves which areeasily accessible for inspection, has ciiicient means ior preventingleakage between the vulves and the piston rod passing through the same,end insures complete exhaustion oic the -piston cylinders, thus givingmaximum edicioncy to the piston stroke.

ln the accompanying drawing- Fig. 1 is a vertical mid-section through apump in which my invention is embodied in one form; and v Fig. 2 is asimiler vienT of the pistons and piston rod showing a detachableconnection.

rlhe present pump is designed primarily as a vacuum pump for priming enassociated centrifugal pump, in a system such as indicsted in myapplication of even date. its utility, however, is not limited to thisperticular field.

- As shown in Fig. 1, in more or less diagremmatic form, the presentpump comprises a pair oie cylinders 1 and 2 which may be of identicalconstruction, the lovver cylinder resting upon a suitable pedestalsupport 3. The cylinders are spaced apart, but united by a group ofspacing; bolts 1l, the reduced ends oi which puse through suitablypierced lateral lugs 5 adjacent the cylinder ends. llach cylinder isprovided with e lateral annular inlet passage 6, which conimunicates onthe one hand with the interior oit its cylinder through ports 7 openingthrough the Wall thereof, and on the other hand, with inlet pipe 8connected to the suction line 9.

Working Within the cylinders are two cup pistons 10 and 11 coupledtogether by e piston rod 12. The pistons ere thus driven in unison tromany suitable source ci power, such as e shaft 13, crenlr lll, andconnecting rod 15 jointed et 16 to the lower piston 11.

The adje-cent ends of the cylinders 1 and 2 are normally closed byvalves 17 and 18, through the hubs 19 oi which the piston rod 12 passes.A coil spring- 20 interposed between the two valves, tends constantly tohold the latter to their seats. Closely surroundingthe hubs 19 ci thevalves is e den ible packing sleeve 23 which serves to prevent leakageof air to the cylinders through the slide bearing between the valve hubsand the piston rod 12. -While I have shown both e valve spring 2() andapacking sleeve 23, it may in some cases suiiice to utilize the fier- 1-ihle packing sleeve sione as the ineens for maintaining the vulvesseated.

The operstion of the pump is readily understood. Upon the drive of thepump from the shaft 13, the piston 11 rising in the cylinder 2compresses the sir in its Working chamber und thus lifts the valve 18from its seat and discharges the compressed sir to atmosphere. As thepiston 11 rises, the piston 10 in cylinder 1 also rises, thus creating apartial vacuum in its WorL- ing chamber. Toward the end ci the Workingstroke, the ports 7 in cylinder 1 are uncovered und air is admitted tothe Working chamber from the suction line 9. A re versal of the strokerepeats the operation. but in the opposite direction. Leakage of airinto the Working; chambers of the cylinders on the suction. strokes oithe pistons is eiiectively prevented, at the slide bearings or" thepiston rod 12 in the hubs of the valves 17 and 1S, by means of theflexible sleeve 23 which forms a seal ier the bearings Without, however,materiallyeifectingthe operation of the valves. The valves themselvesere accessible :it all times for inspection.

The construction of the piston rod 12, and its connection to thepistons, is shown merely diagrammatically in Fig. 1. Any usual connection may be employed which will permit the piston rod to bedisconnected from one or both ci' the pistons to permit the Valves 17and 18, and their associated parts, to be slipped into position on therod 12, while the latter is disconnected. Thus, in Fig. 2 the piston rod24: is shouldered and threaded at its opposite ends to pass through thepiston heads against which it is secured by nuts 25 and 26. The nut 26is pierced to eccommodate the cross pin connection 16 to the connectingrod 15. The cylinders 1 end 2 may be formed as s single casting; withlateral ports between the adiacent ends of the Working chambers, Wheresuch a construction is deemed desirable.

'Various other modifications in 'construe-f tion Will readily occur tothose dealing withL the problem, Without departing from What'l claim asmy invention.

I claiml. In a pump of the type described, a pair of axially alignedWorking cylinders having discharge ports at their adjacent endsopjrnasitelv acting pistons in said cylinders, a pair of valves normallyclosing said ports, a piston rod joining said pistons and passingthrough said valves, and means common to said valves for holding thesame to their seats.

2. In a pump of the type described, a pair of axially aligned workingcylinders having discharge ports at their adjacent ends oppositelyacting pistons in said cylinders, a pair of valves normally closing saidports, a piston rod joining said piston and passing through said valvesand means common t0 said valves for holding the same to their seats,said valves being arranged outside the cylinders and accessible forinspection during the operation of the pump.

3. In a pump of the type described, a pair of axially aligned workingcylinders having ports at their adjacent ends, valves controlling saidports, a piston rod passing through said valves pistons at opposite endsof said rods, and a flexible packing sleeve surrounding said piston rodand sealing the slide bearings between said valves and piston rod.

4. ln a pump of the type described, a pair of axially aligned Workingcylinders having ports at'theiradjacent ends, valves controlling saidports, a piston rod passing through said valves pistons at opposite endsof said rods, and a flexible packing sleeve surrounding said piston rodand sealing the slide bearings between said valves and piston rod, saidvalves having bearinghubs on which said packing sleeve is fitted.

5. A. pump of the type described, a pair of axially aligned Workingcylinders having ports at their adjacent ends, pistons on saidcylinders, a connecting rod passing through said ports and connected tosaid pistons, valves closing said ports and through which said pistonrod slides, a coil spring extend ing between said valves and tending tomaintain the same on their seats, in combination 'with a packing sleevearranged Within said coil spring and engaging the valves to seal theslide joint between the same and the piston rod.

6. ln a pump of the type described, a pair oit axially aligned cylindersopen at their adjacent ends, a pair of valves normally closinoF saidends, said valves discharging to atmosphere and being exposed andaccessible for inspection at all times, together with oppositely actingpistons in said cylinders discharging alternately through the open endsof said cylinders,

7. ln a pump of the type described, a pair of cylinders open at theiradjacent ends, spacing means holding said cylinders in axial alignmentbut with their adjacent ends spaced apart, and valves arranged in `theinterspace between the cylinders and normally closing the adjacent endsthereor", said valves boing accessible for inspection during theoperation of the pump, together with oppositely acting pistonsrin saidcylinders. Y

8.- ln a pump of the type described, a pair of open-ended, axiallyaligned cylinders having their open ends adjacent but spaced .apartexterior, outwardly opening valves seated against said open ends of thecylinders and accessible for inspection during the operation ot thepump, means normally maintaining said valves seated, and pistons Workingin said cylinders.

ln testimony whereof l have signed my name to this specification.

